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Sept. 6, 1932.

J. B..TEESDALE ET AL PUMP Filed May 29. 1930 Patented Sept. 6, 1932 1 .lNrrr.1nl STATES PATENr onirica JOHN B. TEESDALE AND CLYDE H..'.IEESDAILIR` OFGRAND RAPIDS, MICHIGAN, ASSIGN- ORS TO TEESDALE MANUFACTURING COMPANY,Y F GRAND RAPIDS, MICHIGAN, A

CORPORATION 0F MICHIGAN u Application led May 29,

Y except when the oil' level therein falls belowv the normal minimum level and thus prevents suction of 'air through v'the piunp; and generally to provide improved .means of that character such as hereinafter appear.

An illustrative embodiment of the inven- K tion is shown in theVaccompanying'drawing,

wherein: u Y

The figure is a front elevational view'of the entireV pump unit, certain portions being broken Yaway to better illustrate the inside operating parts.

Referring'to the drawing, the booster pum comprises a container 1 ladapted to hold la liquid 2 such as fueloil. The container has a covervplate 3 secured to its upper ends by suitable means such as screws 4. f

Y Mountedon the upper'sideof this cover plate is an electric motor within an electric circuit 6 whose shaft is connected to the shaft of a rotary pump 7 `which supplies liquid to the container 1 throughanintake conduit 8 connectedto the supply pipe 9 which isprovided with a check valve 10 of the spring and ball type.` This conduit is connected to the pump which when operating draws oil therethrough and exhausts it through the pumps outlet port 11 into the container 1.

A minimum liquid level conduit 12 is likewise connectedto the pump 7 and its intake port extendsbelow the vertically projecting 4-5 outletport 13 ofthe container to insure the obvious maintenance cfa minimum liquid level therein. n

A tiltable switch 14 of the mercurytype and within the motor circuit 6 isk operated by the float 15 which is limitedly slidably carnum? 1930. Serial No. 457,227.L

ried on the vertically-disposed stem 16 between the stops 17 18 thereon. The stem is pivotally secured at its upper end to the arm 19 which is connected to the switch 14 *V and the stem slidably passes through an aperture. of the laterally projecting rod 20 intermediate its ends for maintaining thestem in a substantially vertical position. When the normal minimum level 21, which is normally `maintained bythe float-operated switch 14, `falls below such level, aminimum level 22 is maintained within'the container by the upwardly extending youtlet port 13 of the container. Q q

A minimum levell float 23 is, likewise secured tothe stem 16 belowthe switch operatingviioat15 and.` when the liquid within the container thus falls below the normal minimum level 121 to the minimum level 22,;the float 15 falls until it rests on the projecting 70 rod 20 and the Ifloat 23` falls to the position shown contacting the pivotally mounted bell crank lever arm' 24 which opens the valve 25. The pump 7 thus continues to pump liquid through. the minimum level conduit 12 and 75 p exhausts it through the outlet port 11 of the pump instead of pumping air through the intake conduit 8 Awhose supply pipe is closed b v the check valve 10. vThe motor and pump will thus continue to operate until manually shut off by a. master switch, not shown, and the pump is therefore lubricated during this .abnormal operation. y

. .In operation, the motor driven pump 7 produces .a suction inthe intake conduit 8 lwhich vlifts, the ball check valve 10 in the supply "pipe 9 leading to the source of the liquid supply, not shown, and the liquid is eX- pelled through thev outlet port 11 of the pump into the container 1 faster than it flows therefrom through the containers outlet port 13. As the liquid level rises within the container 1. the float 15 continues to rise until it reaches the position shown in dotted lines where it abuts the stop 17 which tilts the switch 14 to shut ofi" the motorr5 and its driven pump 7 .i As the liquid is kwithdrawn from the container 1, the float 15 falls and abuts the stop 18'which closes the tiltable mercury switch 100 14 to turn on the motor 5 to drive the pump 7 In the event however that the source of liquid supply to the container 1 fails or is exhausted, the liquid within the container will fall trom the normal minimum level 21 to the minimum level 22 controlled by the upwardly extending outlet port 13` of the container. As the liquid thus falls to the minimum level 22, the float 23 contacts the pivotally mounted bell crank lever 2liand itsA Y when the source of liquid supply has been replenished thus permitting the unit to again renew its normal operation as soon as the normal minimum level 2l is regained within the container. Y l

While but one specific embodiment of this invention has been hereinY i sho-wn and described, it will be understoodV that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as dened bv the following claims.

We claim: i Y l l. In an organization of the class-described, a container adapted to hold a liquid and having an outlet at the lower portion and provided thereat with means for maintaining a minimum liquid level within the container,

a pump, a liquid intake supply conduit for said container connected to said pump, a minimum liquid level conduit connected to said pump and extending below the minimum liquid level, and a liquid level operated valve for selectively opening the minimum level conduit when the pump in its normal operation fails to drawliquid through the other conduit and the liquid within the container falls to the minimum level. Y.

, 2. In an' organization of `the class described, a container adapted to hold a liquid therein at a normal minimum level and provided at the bottom with an outlet and havingV means ther-eat for maintaining a minimum liquid level withinthecontainer, `an intake conduit for supplying liquid tothe container, an electricallyoperated pump within an electric circuit for drawing liquid into said container through said conduit, an electric switch within said circuit, a iioat within said container operatively associated with thel switch for opening said switch by the movement of the iioat in one direction and orclosing the switch by movement ofthe float in the opposite direction to maintain the liquid normally within the tank between maximum and L minimum levels, a minimum liquid level inlet conduit connected to the pump for supplying liquid thereto and extending below the minimum level, and a liquid level operated valve for selectively opening the minimum liquid level inlet conduit when the liquid level within the container falls to the saidminimum liquid level.

3. In an" organization of the class described, a container adapted to hold a liquid yandprovided at the bottom with an outlet Aand having means thereat for maintaining a minimum liquid level within the container, an intake conduit for supplying liquid to the container, an electrically operated pump within an electric circuit for drawing liquid intovsaid container through said conduit, an electric switch within said circuit, a float within said container operatively associated with the switch for opening said switch by the movement of the float in one direction and' for closing'the'switch by movement of the float in theV opposite direction to maintain the liquid normal within the tank between maximum and minimum levels, a minimum liquid level inlet conduit connected to the pump for supplying liquid thereto and extending below the minimum level, a valve normally closing the minimum liquid level inlet conduit, a second float, and mea-ns larranged in the path of the second float and operatively connected with said valve for causing the said second iiloat to open the valve when the liquid within the container falls to the minimum liquid level.

4,-. In an organization of the class described, a container adapted to hold aV liquid and provided at the bottom with an outlet and having means thereat for maintaining a minimum liquid level within the container, an intake conduit for supplying liquid to the container, an "electrically operated pump Vwithin an electric circuit for drawing liquid into said container through said conduit, an electric switch within said circuit, a float within said container operatively associated with the switch for openingA said switch by the movement of the float in one direction and orclosing the switch by movement of the float in the opposite direction to maintain the liquid normal within the tank between maximum and minimum levels, a minimum liquid level inlet conduit connected to the pump for supplying liquid thereto and extending below the minimum level, a valve normally closing the minimum liquid level inlet conduit, a second float, and a lever operatively connected with the valve and arranged in the path of the said second float and adapted to be actuated by the saine to open the valve when the liquid within the container falls to the minimum liquid level.

5. In an organization of the class described, a container adapted 4to hold a liquid andi provided at the bottom withl an outlet and having means ther-eat for maintaining a minimum liquid level within the container, an intake conduit for supplying liquid to the container, an electrically operated pump within an electric circuit for drawing liquid into said container through said conduit, an electric switch within said circuit, a float within said container operatively associated with the switch for opening said switch by the movement of the float in one direction and for closing the switch by movement of the float in the opposite direction to maintain the liquid normally within'the tank between maximum and minimum levels, a minimum liquid level inlet conduit connected Ito the pump for supplying liquid thereto and eX- tending below the minimum level, a valve normally closing the minimum liquid level inlet conduit, a second float, a lever operatively connected with the valve and arranged in the path of the said second float and adapted to be, actuated by the same to open the valve when the liquid within the container falls to the minimum liquid level, a single stem operatively associated with both` floats, and a manually operable lever connected with the said stem for lifting the floats for readjusting the operating function of the pump.

In testimony whereof we JOHN B. TEES- DALE and CLYDE H. TEESDALE, have hereunto set our hands at Grand Rapids, Michigan, this 24th day of May, 1930, and at Chicago, Illinois, this 26th day of May, 1930, respectively.

CLYDE H. TEESDALE. JOHN B. TEESDALE. 

